PCI Express 4.0 is being designed with tablets in mind, according to standards-setting organization PCI Special Interest Group. The PCI-Express 4.0 bus will also go into PCs, servers and embedded devices. PCIe 4.0, will transfer data at up to 16 gigatransfers per second over copper wire. That is twice the speed of PCIe 3.0, which was finalized in late 2010 and is just reaching products.